PROGRAMLARI DERS NOTLARI [1-4]

KM 331 PROSES BENZETİM

PROGRAMLARI

DERS NOTLARI [1-4]

Kaynaklar

1. Chemcad User Guide and Tutorial, Chemstations, Inc. Version 6.1.

2. Aspen Technology, Inc., Apsen HYSYS ® Version 7.

3. ChemCad Eğitim Notları , Chemstations, Inc- Houston,TX,USA.

4. A Guide for Getting Started in Aspen HYSYS

Dinu Ajikutira, Sr. Director, Engineering Product Marketing, Aspen Technology, Inc.

ChemCad Paket Programına Giriş

• 1984: professors develop first PC based process

simulator; sell technology to McGraw Hill

• 1988: Chemstations purchases ownership and begins

marketing CHEMCAD.

• 1992-1999: Chemstations launches CC-THERM, CC-

BATCH, CC-ReACS, and CC-DCOLUMN.

• 2000: Chemstations sells to 1000th customer

• 2006: Chemstations builds an OPC Server interface into

CHEMCAD

What does a process simulator do?

• heat and mass balances around unit operations

• calculation of what happens with vapor and liquid in

unit operations

• Process simulators have databanks of transport

properties of chemicals, thermodynamic models for

vapor liquid equilibria, and models for common unit

operations

If I have 10 lbs of water, 2 lbs of nitrogen, and 1 lb of

toluene and I add heat...what is the vapor composition?

What is the temperature?

Components of a simulator

• Chemical database for calculating properties

(Cp=f(A,B,C,D,T)

• Unit operation models (Q=U*A*LMTD)

• Thermodynamic package to calculate VLE (yi*P

= xi*Pisat)

• Graphic User Interface for flowsheeting

• Report tools

Mass and Energy balance

Thermo II: flash calculation

Unitops: Stepwise Distillation • To derive the operating line equation, perform a material balance for the more

volatile component:

• Vn+1 yn+1 = Ln xn + D xD

•

• Assume constant molal overflow;

• Vn+1 = Vn = ........ = V

• Ln = Ln-1 = ........ = L

•

The rectifying operating line thus becomes: V yn+1 = L xn + D xD

• Now, from Vn+1 = Ln + D, we have V = L + D

What do engineers do with process

simulators?

• Model existing facilities

• Design new facilities

• Connect to control system for monitoring /

control

• Study relief devices and piping networks

• Related calculations (unit conversions, transport

properties)

Designing new process

• Determine if process is feasible

• Look for problem areas

• Try different configurations before you build

• In the real world, you apply heat and measure

the result

• In simulation, you specify the result you want,

and calculate the heat you need

Ethanol by entrainment

Ethanol by pressure swing

Physical Properties

Database

CC-BATCH

Batch Distillation

CC-DCOLUMN

Dynamic Column

CC-SAFETY NET

Pipe/Flare/Relief

CC-ReACS

Batch Reactors

CC-THERM

Heat Exchanger

CHEMCAD

Steady State

Process Simulations Solutions